1.

the atomic number of 3 elements A,B,C are 12,18,20 respectively. state giving reason which 2 elements will show similar properties.

Answer»

The ELEMENTS a,b,c are sodium , chlorine and pottasium respectively .
out of these , Na and K have the same properties as they FALL into the same group , GROUP _ 1 .they are alkali METALS , having their valency as 1
chlorine, is a NON metal , so it does not have any similar properties



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